tar: support -J, --xz explicit compression option

function                                             old     new   delta
tar_main                                             868     881     +13
tar_longopts                                         285     290      +5
packed_usage                                       29267   29270      +3

Signed-off-by: Boris Reisig <boris@boris.ca>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 15 insertions, 2 deletions

diff --git a/archival/tar.c b/archival/tar.c
index a64d6510f..a3565d6ae 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -693,6 +693,7 @@ static llist_t *append_file_list_to_list(llist_t *list)
 //usage:        "-[" IF_FEATURE_TAR_CREATE("c") "xt"
 //usage:        IF_FEATURE_SEAMLESS_Z("Z")
 //usage:        IF_FEATURE_SEAMLESS_GZ("z")
+//usage:        IF_FEATURE_SEAMLESS_XZ("J")
 //usage:        IF_FEATURE_SEAMLESS_BZ2("j")
 //usage:        IF_FEATURE_SEAMLESS_LZMA("a")
 //usage:        IF_FEATURE_TAR_CREATE("h")
@@ -719,6 +720,9 @@ static llist_t *append_file_list_to_list(llist_t *list)
 //usage:        IF_FEATURE_SEAMLESS_GZ(
 //usage:     "\n        z       (De)compress using gzip"
 //usage:        )
+//usage:        IF_FEATURE_SEAMLESS_XZ(
+//usage:     "\n        J       (De)compress using xz"
+//usage:        )
 //usage:        IF_FEATURE_SEAMLESS_BZ2(
 //usage:     "\n        j       (De)compress using bzip2"
 //usage:        )
@@ -765,7 +769,8 @@ enum {
         IF_FEATURE_TAR_FROM(     OPTBIT_INCLUDE_FROM,)
         IF_FEATURE_TAR_FROM(     OPTBIT_EXCLUDE_FROM,)
         IF_FEATURE_SEAMLESS_GZ(  OPTBIT_GZIP        ,)
-        IF_FEATURE_SEAMLESS_Z(   OPTBIT_COMPRESS    ,) // 16th bit
+        IF_FEATURE_SEAMLESS_XZ(  OPTBIT_XZ          ,) // 16th bit
+        IF_FEATURE_SEAMLESS_Z(   OPTBIT_COMPRESS    ,)
         IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
         OPTBIT_NORECURSION,
@@ -790,6 +795,7 @@ enum {
         OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM(     (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
         OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM(     (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
         OPT_GZIP         = IF_FEATURE_SEAMLESS_GZ(  (1 << OPTBIT_GZIP        )) + 0, // z
+        OPT_XZ           = IF_FEATURE_SEAMLESS_XZ(  (1 << OPTBIT_XZ          )) + 0, // J
         OPT_COMPRESS     = IF_FEATURE_SEAMLESS_Z(   (1 << OPTBIT_COMPRESS    )) + 0, // Z
         OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
         OPT_NORECURSION     = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION    )) + 0, // no-recursion
@@ -798,7 +804,7 @@ enum {
         OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
         OPT_OVERWRITE       = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE      )) + 0, // overwrite
 
-        OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_COMPRESS),
+        OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_XZ | OPT_COMPRESS),
 };
 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
 static const char tar_longopts[] ALIGN1 =
@@ -831,6 +837,9 @@ static const char tar_longopts[] ALIGN1 =
 # if ENABLE_FEATURE_SEAMLESS_GZ
         "gzip\0"                No_argument       "z"
 # endif
+# if ENABLE_FEATURE_SEAMLESS_XZ
+        "xz\0"                  No_argument       "J"
+# endif
 # if ENABLE_FEATURE_SEAMLESS_Z
         "compress\0"            No_argument       "Z"
 # endif
@@ -924,6 +933,7 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
                 IF_FEATURE_SEAMLESS_LZMA("a"   )
                 IF_FEATURE_TAR_FROM(     "T:X:")
                 IF_FEATURE_SEAMLESS_GZ(  "z"   )
+                IF_FEATURE_SEAMLESS_XZ(  "J"   )
                 IF_FEATURE_SEAMLESS_Z(   "Z"   )
                 IF_FEATURE_TAR_NOPRESERVE_TIME("m")
                 , &base_dir // -C dir
@@ -1076,6 +1086,9 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
                 if (opt & OPT_LZMA)
                         USE_FOR_MMU(xformer = unpack_lzma_stream;)
                         USE_FOR_NOMMU(xformer_prog = "unlzma";)
+                if (opt & OPT_XZ)
+                        USE_FOR_MMU(xformer = unpack_xz_stream;)
+                        USE_FOR_NOMMU(xformer_prog = "unxz";)
 
                 open_transformer_with_sig(tar_handle->src_fd, xformer, xformer_prog);
                 /* Can't lseek over pipes */